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Finding the Fourth Proportional to 829.99, 1,243.87 and 439.89

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Solution

The fourth proportional to 829.99, 1,243.87 and 439.89 is: 659.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.99 : 1,243.87 = 439.89 : x
  2. Step 2: Convert to fraction form
    829.99/1,243.87 = 439.89/x
  3. Step 3: Cross multiply
    829.99x = 1,243.87 × 439.89
  4. Step 4: Simplify right side
    829.99x = 547,165.97
  5. Step 5: Solve for x
    x = 547,165.97/829.99
  6. Step 6: Final answer
    x = 659.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.